diff --git a/src/Bundle/ChillMainBundle/Entity/Embeddable/PrivateCommentEmbeddable.php b/src/Bundle/ChillMainBundle/Entity/Embeddable/PrivateCommentEmbeddable.php
index 09a35324e..00e0f29d7 100644
--- a/src/Bundle/ChillMainBundle/Entity/Embeddable/PrivateCommentEmbeddable.php
+++ b/src/Bundle/ChillMainBundle/Entity/Embeddable/PrivateCommentEmbeddable.php
@@ -54,9 +54,9 @@ class PrivateCommentEmbeddable
         return $this;
     }
 
-    public function setCommentForUser(User $user, string $content): self
+    public function setCommentForUser(User $user, ?string $content): self
     {
-        $this->comments[$user->getId()] = trim($content);
+        $this->comments[$user->getId()] = trim((string) $content);
 
         return $this;
     }